During the typesetting process for this article (Eliantonio M. and Vogiatzis N., 2021), which introduces the GLJ Special Issue 21.3 on Judicial and Extra-Judicial Challenges in the EU Multi- and Cross-Level Administrative Framework, the following footnote was removed from the published PDF version. The PDF has now been updated to correct this error and to ensure consistency with the HTML version. As the publisher, we issue this erratum for the sake of transparency in the scholarly record and in order to offer our sincerest apologies to the authors for the error.

“This project has its origins in panels that were convened by the editors for the UACES Annual Conference in Krakow (2017) and their participation in the “EU Multilevel Administration and Governance” working group of the EGPA Conference in Lausanne (2018). Yet, the key event that led to the realization of this Special Issue was a workshop, with the same title, that was organized in July 2019 in Brussels at Maastricht University’s Brussels Campus. Financial support for this workshop was generously provided by the University of Maastricht and the University of Liverpool Research Development Fund. The editors would also like to express their gratitude to colleagues who acted as chairs and discussants on that day: Natassa Athanasiadou, Filipe Brito Bastos, Darryn Nyatanga, and Lilian Tsourdi. We would also like to thank the GLJ editorial team for assistance throughout the different stages of the process and, in particular, Matej Avbelj, who read all the Articles after the completion of our review.”